| 摘要 |
A metronome for indicating musical tempo, the device comprising a series of cylinders mounted on a shaft that is driven by an electric motor, each of the cylinders having a radially outwardly extending spoke or several spokes adaptable to strike a sound producing device that is slideable along a rod for selectively engaging the spokes of a specific cylinder, and the sound-producing device being rapidly slideable along the rod by means of a foot controlled mechanism.
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